A decade later, the members have reconvened as private citizens to reflect upon the changes of the past 10 years and the emerging threats the U.S. faces as a country. In recent months, they have spoken with some of the country's most senior national security leaders -- current and recently retired. What the former commissioners, now working as the Bi-Partisan Policy Center, found: "counterterrorism fatigue and a waning sense of urgency among the public threaten U.S. security."

According to their report, "many Americans think that the terrorist threat is diminishing -- that, as a country, we can begin turning back to other concerns. They are wrong..."